1. Interaction of radiation with atoms and ions (I)
Blackbody radiation
Wave equation + boundary conditions
Planck’s law
Absorption- Stimulated emission E2
W12 =W21 E1

2. Interaction of radiation with atoms and ions (II)
More definitions
Cross section
Absorption coefficient
Gain
Spontaneous emission
Ratio stimulated/spontaneous emission for blackbody radiation
spontaneous !

3. Interaction of radiation with atoms and ions (III)
Line broadening
Homogeneous
(Lorentz)
Collisions
Spont. emission
Inhomogeneous
(Gauss)
Doppler
Local field
Phonons
Saturation 2 2 1 1
High absorption
Reduced absorption

4. Ray and wave propagation through optical media
Matrix- formulation of Geometric Optics
Material with index n
lens
Gaussian Beam
ABCD law

5. Gaussian beam solution
Stable resonators
Stability condition
General case
Two-mirror resonator
Round trip matrix
Gaussian beam solution
Single passage matrix
Frequencies